The last one I saw used one 2764 on the cheap squeak.

The last page of the game manual also lists one rom at U3.

Hi Dave,

It’s Jack btw. That board came out of an X’s and O’s which also uses one 2764, so I left the jumpers as is assuming he would be using a 2764 for Lady Luck. The manual is on IPDB, and it has the original rom numbers listed on the last page. Hope that helps.

before you do that, you should be able to use the 2532's. Did you install them in the upper part of the socket? You need to put them in the lower portion of the socket, leaving position 1,2 , 27 and 28 open.